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Plate tectonics Questions 1-3 1. His colleagues at the time argued for polar wandering as an explanation of his data. These ideas were not well accepted until later scientists in the 1940's and 50's expanded on these ideas adding to them pale magnetism. Convection currents and sea floor spreading. 2.He was just a meteorologist, They thought he was faking his data, No one could figure out how a huge continent could move. 3. Arthur Holmes published his idea that thermal convection in the earth's mantle could cause continents to move. Discoveries of the Mid-Ocean Ridge and the work of Harry Hess and others led to the development of plate tectonics. Questions 4-8 4. North American plate, Eurasian plate, and oceanic plate. 5. America is on the North American plate boundary and Europe is on the Eurasian plate boundary. 6. Divergent, convergent and oceanic. 7. Divergent boundaries or were two plates move away from each other and oceans are born as they grow wider. Convergent is when two plates come together and form subduction zones. Mountains and Volcano are often found where plates converge. 8. Ocean trenches and volcanoes both occur where continental plates collide, or meet. An Ocean trench is also noted for the presence of a volcanic arc. Questions 9 9. The rocks off of the east coast of North America are much older than those right along the mid-Atlantic ridge because sea-floor spreading is occurring where oceanic plates are divided. Questions 10-11 10. 11.Radioactive decay and Residual heat Questions 12-14 12. The convergent forces make volcanoes and mountains because the two plate colliding together. 13. Horst and graben are terms referring to regions that lie between normal faults and are either above or lower than the area beyond the faults. A horst represents a block pushed upward by the faulting, and a graben is a block that has dropped due to the faulting. 14. They were formed when California and Washington clashed into Nevada and Utah which both being the same mass as the other, instead of one being pushed down both went up becoming mountains. Questions 15-16 15. Earthquakes and volcanoes. It causes a surface source, called the epicenter, to create three kinds of waves: Primar waves, Secondary waves, and surface waves. The P waves go first. Finally the surface, which cause the most damage. That's how earthquakes are made. 16. They provide use with more water every time a divergent boundary forms, the movement of the tectonic plates do is recycle the carbon dioxide, helping the planet from undergoing a runaway greenhouse climate, and Ore deposits, fertile soils, and fossil fuels are three good things that plate tectonics provide for humans.